Hebern: 9th Problem

Munitions Buildings, Washington D.C.

Signal Intelligence Service

May 8th, 1931

My dear students,

This problem isn't too complicated. You need to
determine the rotor wiring from a pair of
messages (plaintext/cryptogram). To prove your
success, you must decipher another cryptogram.

Note: the order of the rotors is the same for both
messages and rotors II, III and IV are stationary
during encryption.

W.F. Friedman

Dispatch #1 Cryptogram

UPEYQ RVHFQ XPDAU CDDZE VFFZB LYBSO MFYCD IWMCC PAWIO WLTDE
FFSPY DBSJM EQMJR DOYND XUQGM XAJJC DAPTE IRXHV UZBXA FFRYG
GWTIV CTPJN TEBYQ GMXUK ACKRZ IHNKE OVUBH HTELM IAUAJ QXMFB
GAKAD WYUPJ VZXUL DWFEH FXVAK SKPXE XYKHG FDAQK DPKOR JQBAF
LADCB VCBEI WJAOZ VSKYN BZIQR AGUIR NXJFK FIWVW BWGGP XFJJY
HVLSM TMEXY TDZLG MEEVD SCMRY QBKJJ HKDWK FRNJG HEPAD GNIIH
HFSEA OKBKI JGSPK G

Dispatch #1 Plain text

TOBEO RNOTT OBETH ATIST HEQUE STION WHETH ERTIS NOBLE RINTH

EMIND TOSUF FERTH ESLIN GSAND ARROW SOFOU TRAGE OUSFO RTUNE

ORTOT AKEAR MSAGA INSTA SEAOF TROUB LESAN DBYOP POSIN GENDT

HEMTO DIETO SLEEP NOMOR EANDB YASLE EPTOS AYWEE NDTHE HEART

ACHEA NDTHE THOUS ANDNA TURAL SHOCK STHAT FLESH ISHEI RTOTI

SACON SUMMA TIOND EVOUT LYTOB EWISH DTODI ETOSL EEPTO SLEEP

PERCH ANCET ODREA M

Dispatch #2 Cryptogram

XHGBL NKUEG AOYWQ LSKVT MSHUT RNJLV JFHDD YROTY MZQIX JCFEI

CDTQO XTDRZ IPSAQ BBXZS XGNYO IGIOI GNXYW CFJXS RHARS ANRIU

CRGAQ NXQOZ WJLIX ZQDEP ELVSE JGWRA WVGAG BQDJW IZRUA GLJOL